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KB5124010: Overview with user sentiment and feedback

Last Updated October 31, 2026

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Known Issues

Overview

KB5124010 is the September 22, 2026 optional non-security preview update for Windows 11 24H2, 25H2, and 26H2, raising builds to 26100.9550, 26200.9550, and 26300.9550. It is delivered via Windows Update as an optional update and is the final preview release for 24H2, whose Home and Pro editions reach end of servicing in October 2026. It contains quality fixes and new features but no security fixes.

General Purpose

  • Adds Copilot key remapping (to Right Ctrl or Context Menu), Emoji 17.0 support, and an "Open apps maximized" accessibility option.
  • Bluetooth fixes: radio toggle state mismatch, 0x139 crash while streaming audio, LE Audio and microphone compatibility improvements.
  • Touchpad gains single-finger and automatic scrolling; Camera roll backup to OneDrive is introduced in Settings.
  • Fixes File History backup/restore failures and a Secure Trust issue causing domain sign-in failures on domain-joined devices.
  • Removes PC-to-PC Migration in favor of Windows Backup; adds permanent DST for British Columbia and Alberta from November 2026.

General Sentiment

Community coverage is limited to a short news write-up and one brief comment, with no substantial forum discussion found. Reporting frames the update as a routine preview with many fixes, and the main negative note is the removal of PC-to-PC Migration and the end of 24H2 preview updates.

Known Issues

  • Non-admin users may fail to RDP into hosts with Administrator protection enabled (error 0xC000000D); fixed in KB5127936 for 26H2/25H2, workaround needed on 24H2.
  • Legacy apps requiring AC-3 audio decoding may fail to launch or close unexpectedly; fixed in updates from October 13, 2026 (KB5127648).
  • Some devices may show a black screen or desktop loading failure after sign-in, mainly on AVD hosts using FSLogix; fixed in KB5127648.
  • USB Audio Class 1.0 devices may show Code 10 or produce no audio after the September 8, 2026 security update; no resolution yet.

Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-10-31 07:40 PM

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